Email disappeared - HELP!

I just lost a fairly important and very large email. I did not knowingly delete it and I can find absolutely no trace of it anywhere what so ever. I asked the recipient to FWD it back to me, and she did, however, there seems to be a lot of text missing - hence the problem.

Anybody have any ideas where it may have gone? Does Mail.app have "secret" backup folders somewhere? I've searched in different ways but haven't found a trace of anything.

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